An Observational Study of Intramonthly Quasi-Periodicities in the Northern Heimsphere, Extratropical Geopotential Height Field

北半球温带位势高度场月内准周期观测研究

• 批准号: 8708170
• 负责人: Anandu Vernekar
• 金额: $ 4.78万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-08-01 至 1990-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8708170&HistoricalAwards=false
• 关键词: Observational; Study; Intramonthly; Quasi; Periodicities

This research is aimed at investigating 10-30 day quasi- periodic phenomena in the extratropical, cold season tropospheric geopotential heights of the Northern Hemisphere. The search for such phenomena is justified on experimental, theoretical and observational grounds. They will be examined using theory as guidance. A variety of statistical techniques will be utilized in order to assess the significance and quantify the importance of such phenomena. Unlike most other studies of this type the non-stationarity of these phenomena will be incorporated directly into the analyses and significance testing. Also, the analyses will allow for regionality and will be based on a much larger sample than most prior studies of this nature. Rotated complex principal components (RCPC's) will be used in this study. The RCPC analysis technique, which is a powerful statistical tool, has been introduced to meteorologists only very recently. This and several simpler approaches will yield time series of amplitude and phase. The statistical tests will be performed primarily on these time series. The results of this study should put into prospective various aspects of the variability of tropospheric heights in the 10-30 day range, including regularity, duration and relation of the quasi-periodic phenomena to the quasi-stationary state. This research is important because it applies rigorous statistical analysis to a long-term, high quality set of atmospheric circulation observations to seek answers to the question of the importance of intraseasonal oscillations on climate characteristics.

本研究旨在调查10-30天的准 冷季对流层外的周期现象 北方半球的位势高度。 寻找 这种现象是合理的实验，理论和 观察的理由。 他们将使用理论进行检查， 指导 将利用各种统计技术 为了评估重要性并量化重要性 这种现象。 与大多数其他此类研究不同， 这些现象的非平稳性将被直接纳入 进行分析和显著性检验。 此外，分析 将考虑到区域性，并将基于一个更大的 比大多数以前的研究这种性质的样本。 旋转复形 主成分（RCPC）将用于本研究。 的 RCPC分析技术是一种强有力的统计工具， 直到最近才被介绍给气象学家。 这 几种更简单的方法将产生时间序列， 振幅和相位。 将进行统计检验 主要是这些时间序列。 这项研究的结果应该 把未来的变化的各个方面， 10-30天范围内的对流层高度，包括 准周期现象的规律性、持续时间和关系 到准稳态。 这项研究很重要，因为它应用了严格的 统计分析，以长期，高质量的 大气环流观测， 关于季节内振荡的重要性问题 气候特征。